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Angular variation of the infrared emissivity of ice and water surfaces

1992; Taylor & Francis; Volume: 13; Issue: 15 Linguagem: Inglês

10.1080/01431169208904088

1366-5901

Gareth Rees, S. P. James,

Climate change and permafrost

Abstract An experimental investigation of the emissivity of water and ice surfaces in ihe thermal infrared (8-14 μm) band is described. The experimental technique is a particularly simple one, suited for rapid determination of emissivity in the laboratory, yet it yields an accuracy of ±001 for relative emissivity over a wide range of viewing angles. The results show that the emissivity of an ice surface is significantly lower than that of a water surface for angles up to at least 65° from the surface normal and thai both are in approximate agreement with the Fresnel formula for a plane interface between homogeneous media. The implications of the numerical results for airborne and spaceborne remote sensing of freezing water are discussed.